CN1231656C - Method of passing fracture of underground gasification furnace - Google Patents

Abstract

The present invention relates to a method for underground gasification furnaces to pass faults. Two service roadways, namely an upper combustion guiding roadway and a lower combustion guiding roadway, are oppositely dug at one of two faces of a fault in a furnace body, which is far away from a gasification channel, along the fault strike with two air flow channels used for opening. The lower combustion guiding roadway is near the fault, and the frontal of the lower combustion guiding roadway or a position with a definite distance to the frontal is opened to form a transition roadway which penetrates through the fault to communicate coal seams on the upper and the lower faces of the fault. Coal pillars with a certain width are arranged between the frontals of the upper and the lower combustion guiding roadways and the opposite air flow channels, the two combustion guiding roadways approach to each other to form an overlay segment between the two combustion guiding roadways, and the overlay segment has a certain useful length and the width of the coal pillar. When air inlets and air outlets, which are arranged at the upper ends of the two air flow channels, are respectively positioned on the upper and the lower faces of the fault, only the lower combustion roadway and the transitional roadway are dug. The special roadway arrangement is utilized to make a gasification working face communicated with the upper and the lower combustion guiding roadways through combustion by means of self-combustion in the propulsion of continuous combustion and gasification. The method reduces resource loss, avoids repeated construction, saves investment and is economy and easy to implement.

Description

The method of passing fracture of underground gasification furnace

Technical field

The present invention relates to coal underground gasifying technology, particularly a kind of in the underground gasification furnace coal seam, run into drop near or during greater than the tomography of coal seam thickness, allow gasification face rely on self combustion gasification and constantly propelling, cross tomography voluntarily and be not blocked the method for the passing fracture of underground gasification furnace that keeping gasifies proceeds.

Background technology

In coal underground gasifying technology, underground gasification furnace is that underground coal is carried out the place that thermal chemical reaction produces fuel gas, and it is made up of body of heater and guiding channel.Body of heater is made of gasification tunnel, gas channel.1. gasification tunnel generally is along the trend in coal seam or closely move towards layout, and special circumstances arrange along pseudo-incline direction, as: limited by boundary fault; It is the place of underground gasification furnace igniting initial stage thermal chemical reaction, along with the operation of underground gasification furnace, moves to the direction of going up a hill gradually, is called gasification face this moment.2. gas channel is general arranges along the tendency or the nearly tendency in coal seam respectively, and special circumstances arrange along pseudo-incline direction, as: limited by boundary fault.Gas channel generally has two, and its lower end is connected to the gasification tunnel two ends, is the passage of gasification tunnel into and out of air-flow, plays a part gasification tunnel supply gasifying agent and discharge coal gas; Their upper end links to each other with guiding channel respectively.Along with the operation of underground gasification furnace, gasification face constantly advance to the direction of going up a hill, the length of gas channel will shorten gradually, until gasify to their upper end, i.e. the inlet, outlet of two gas channels.3. guiding channel: generally have two; Gas outlet, guiding channel one termination gas channel upper end wherein, other end ground plane gas flue; Another guiding channel one termination gas channel upper end air inlet port, air feed equipment other end ground plane or the down-hole or steam line.Guiding channel can be boring, vertical, tunnel or pipeline etc., also can be their hybrid mode.

If in body of heater, have drop near or greater than the tomography of coal seam thickness, the coal seam will be disconnected substantially or fully.When gasification face in constantly combustion gasification, progradation, run into such tomography, will be because of the coal seam discontinuous or continuous part is very few, continue normally to carry out even interrupt and can not keep gasification.So, in body of heater, all do not allow in the past drop near or greater than the thick tomography of coal, make many coal seams be difficult to arrange underground gasification furnace because of the tomography problem, perhaps be forced to be divided into the little gasification furnace of a plurality of bodies of heater, the underground gasification rate of recovery is reduced greatly, or gasification investment increases considerably, and limited the development of underground coal gasification(UCG).And the exploitation of not easy-to-use roadway method, mine abandons in the coal seam, the zone of geological structure complexity, mature fault often.

Summary of the invention

The technical problem to be solved in the present invention is: when run in the coal seam of underground gasification furnace drop near or during greater than the tomography of coal seam thickness, manage to allow gasification face rely on the combustion gasification of self, constantly propelling, can cross tomography voluntarily and continue to advance, and not be blocked; Thereby the minimizing resources loss is avoided the underground gasification furnace repeated construction, reduces investment outlay; A kind of passing fracture of underground gasification furnace method is provided for this reason.

Can be by the following technical solutions for solving the problems of the technologies described above the present invention:

Using gasification tunnel, gas channel and guiding channel thereof, make up in the process of underground gasification furnace, when in body of heater, running into drop more than or equal to the strike fault of coal seam thickness or skew fault, the method of passing fracture of underground gasification furnace is: two dishes at tomography coil away from one of gasification tunnel, along fault strike, open the door from two gas channels respectively, relatively dig two adits---go up combustion guiding gallery and following combustion guiding gallery.Following combustion guiding gallery is near tomography driving, with the spacing of tomography be 0～15m, meeting head on or return 1～20m and open the door, dig the transfer gallery that passes tomography at combustion guiding gallery down.Transfer gallery passes the coal seam of tomography to another dish of tomography.When the length of transfer gallery＞5m, must stack continuous diffusing coal in the lane.Last combustion guiding gallery meet head on relative gas channel between, and down combustion guiding gallery meet head on relative gas channel between, stay coal column, coal pillar width: girdle＞5m, in thick and high seam＞10m.Between last combustion guiding gallery and the following combustion guiding gallery one section overlay segment close to each other is arranged, the effective length＞5m of this overlay segment, coal pillar width between overlay segment place two combustion guiding galleries: girdle be 3～15m, in thick and high seam be 5～20m.The effective length of so-called overlay segment, that is: the length of overlay segment deducts downcombustion guiding gallery 6 and meets head on to the distance oftransfer gallery 8 opening positions.

Inlet, outlet when underground gasification furnace two gas channels upper ends, when laying respectively at upper and lower two dishes of tomography, only pick combustion guiding gallery and transfer gallery thereof down do not dug combustion guiding gallery.Transfer gallery should be located near gas channel one side of its inlet, outlet under tomography.Under the tomography, refer to the dish that tomography is nearer apart from gasification tunnel.

Can also be by the following technical solutions for solving the problems of the technologies described above the present invention:

When its transfer gallery is crossed tomography, vertically pass tomography; After crossing tomography and seeing coal, continue driving 2～10m along the coal seam, and along fault strike, one section auxiliary counter-fire lane of pick.Length that should auxiliary counter-fire lane is 1～20m, its meet head on relative gas channel between coal pillar width, with following combustion guiding gallery meet head on and this gas channel between coal pillar width require identical.

In its upper and lower combustion guiding gallery and the auxiliary counter-fire lane, stack continuous diffusing coal.For transfer gallery, when its length≤5m, preferably also to stack continuous diffusing coal in the lane.The stacking amount of diffusing coal will make it stack cross-sectional area and account for 1/4～3/4 of tunnel cross sectional area.

On it combustion guiding gallery meet head on relative gas channel between and down combustion guiding gallery meet head on and relative gas channel between the preferred value of coal pillar width: girdle is that 20～30m, medium-thickness seam are that 25～35m, high seam are 30～40m.

Spacing of combustion guiding gallery and tomography serves as preferred with 1～10m under it; The effective length of upper and lower combustion guiding gallery overlay segment serves as preferred with 10～20m.

When tomography was skew fault, transfer gallery was crossed the position of tomography, should be selected in a side of distance between tomography and the gasification tunnel, or was selected in the centre that gasification furnace is walked to make progress.

When non-overlapped section length of last combustion guiding gallery 〉=20m, last combustion guiding gallery is also near the tomography driving, when the pick of last combustion guiding gallery to meeting head on during 5～20m apart from combustion guiding gallery down, change direction again, drive up along the coal seam, whendistance 5～15m of meeting head on following combustion guiding gallery or its extended line, change the orientation again, by being parallel to the down direction of combustion guiding gallery, continue to excavate and following combustion guiding gallery between overlay segment.

When the coal seam in tomography or the body of heater was moisture, the gradient of upper and lower combustion guiding gallery can flow out the water of upper and lower combustion guiding gallery along level or positive gradient driving naturally.

The invention has the beneficial effects as follows: 1. make full use of the underground coal resource, reduce resources loss; Make full use of the infrastructure of underground gasification furnace, avoid the repeated construction of underground gasification furnace project, reduce the construction works amount, reduce investment outlay.2. method is simple, and economy and facility is safe and reliable.

Description of drawings

Fig. 1: underground gasification furnace is crossed the floor map of strike fault or skew fault tomography

The A-A sectional view of Fig. 2: Fig. 1, transfer gallery are passed the schematic diagram of tomography by the lower wall of normal fault

Fig. 3: underground gasification furnace is crossed the floor map of the bigger skew fault of gradient

The B-B sectional view of Fig. 4: Fig. 3, transfer gallery are passed the schematic diagram of tomography by the lower wall of reverse fault

Fig. 5: the gas channel air inlet port is positioned at the schematic perspective view of the passing fracture of underground gasification furnace under the tomography

Fig. 6: the gas channel gas outlet is positioned at the schematic perspective view of the passing fracture of underground gasification furnace under the tomography

The specific embodiment

The invention will be further described below in conjunction with drawings and Examples.

Embodiment 1:

Fig. 1,2 illustrates the conventional method of passing fracture of underground gasification furnace of the present invention.Said tomography be meant drop greater than or near the thick tomography of coal, the basic identical or oblique of fault strike and bearing, the i.e. basic identical or oblique of direction of fault strike and gasification tunnel 10.As: coal seam thickness 2.2m, fault throw 2.4m.Tomography can be a normal fault, also can be reverse fault.If fault throw is excessive or the inclination angle is excessive, and is unreasonable economically.

In the building process of underground gasification furnace, utilize the original production system of mine in the down-hole, adopt common driving method, 11 tendencies or closely be inclined to direction drivinggas channel 2 and 4 along the coal seam, 11 the trend or closely move towards direction drivinggasification tunnel 10, the scope of irising out body of heater along the coal seam.By the common drilling method in ground, get out air inlet 1 and steam vent 3, the sleeve pipe of packing into connects with thegas channel 2 of down-hole and 4 upper end respectively.In this underground gasification furnace, two guiding channels that air inlet 1 and steam vent 3 are air inlet and give vent to anger; And air inlet 1 and steam vent 3 and thegas channel 2 and 4 that is attached thereto can carry out the conversion of inlet, outlet according to the gasifier operation needs.In tunneling construction, when running intotomography 7, except will passing tomography to another dish coal seam, continue the driving twogas channels 2 and 4, the method and the measure of crossing tomography are: at the dish away fromgasification tunnel 10 oftomography 7, move towards, open the door, relatively tunnel two adits by twogas channels 2 and 4 respectively along tomography 7: upper and lowercombustion guiding gallery 5 and 6, and thetransfer gallery 8 that is connected with following combustion guiding gallery 6.Wherein:

Following combustion guidinggallery 6---neartomography 7, withtomography 7 move towards substantially parallel, andtomography 7 between spacing L₁Between 0～15m; Its top connectsgas channel 4, from meeting head on or returning 1～20m and open the door, dig onesection transfer gallery 8 that passes tomography 7.Between following combustion guidinggallery 6 and therelative gas channel 2 will near and keep the coal column of certain width, this coal pillar width L₅: girdle＞5m, in thick and high seam＞10m.Preferably stack continuous diffusing coal in the lane.Generally, the spacing L of following combustion guidinggallery 6 andtomography 7₁Preferred value be 1～10m, specifically decide according to the geological conditions of tomography; Following combustion guidinggallery 6 meet head on andgas channel 2 between coal pillar width L₅Preferred value be:girdle 20～30m, medium-thickness seam 25～35m, high seam 30～40m.

Transfer gallery 8---passing tomography 7, is the passage in the upper and lower dish coal seam 11 ofcommunication barrier 7; Can be vertical withtomography 7 trend, also can oblique, but preferably vertical.Drop is approached the thick tomography ofcoal 7, can crosstomography 7 with playing the method for caunching at the end; Greater than thethick tomography 7 of coal, to dig one section rock gangway in the middle of it: rock inclined gallery or crossdrift to drop.Pass meeting head on oftomography 7 one ends, pick to another dish coal seam 11, see coal after, preferably 11 continue pick 2～10m along the coal seam.Its section can be trapezoidal, rectangle, arch etc.Whentransfer gallery 8 length L₇During＞5m, must stack continuous diffusing coal in the lane; Work as L₇During≤5m, preferably also stack continuous diffusing coal in the lane.

Last combustion guidinggallery 5---withtomography 7 trend,combustion guiding gallery 6 is substantially parallel down, the one end starts fromgas channel 2, the other end meet head onrelative gas channel 4 will near and keep the coal column of certain width, this coal pillar width L₄, and the coal pillar width L between following combustion guidinggallery 6 and thegas channel 2₅Require identical.Preferably stack continuous diffusing coal in this lane.

The overlay segment that one section close to each other, almost parallel will be arranged between last combustion guidinggallery 5 and the following combustion guidinggallery 6, this overlay segment require the coal column that certain effective length arranged and keep certain width.The effective length L of overlay segment₃, promptly the length of overlay segment deducts down combustion guidinggallery 6 and meets head on to the distance oftransfer gallery 8 opening positions.Generally, effective length L₃＞5m; The coal pillar width L of overlay segment₂: girdle can be selected at 3～15m, in thick and high seam select at 5～20m.For example: for the medium-thickness seam of 2m, its L₃Optional 5m, 20m, 40m, preferred value is 10～20m; Coal pillar width L₂Optional 5m, 10m, 20m.

Above-described go up combustion guidinggallery 5 meet head onrelative gas channel 4 between coal pillar width L₄, down combustion guidinggallery 6 meet head onrelative gas channel 2 between coal pillar width L₅, the coal pillar width L of combustion guidinggallery 5 and 6 overlay segment up and down₂Andauxiliary counter-fire lane 9 meet head onrelative gas channel 2 between coal pillar width L₆Selection, remove according to coal seam thickness, also to consider the factors such as hardness of coal bed joints, crack and coal, coal seam thickness is big, joint, cranny development, the hardness of coal is little, coal pillar width then selects greatly; Otherwise, select littler.

The stacking of above-mentioned diffusing coal in last combustion guidinggallery 5 and following combustion guidinggallery 6, be helped to stack along the upward group or two in tunnel, stack continuously, and the highest point of stacking forms contact surface to top board or with top board; The most handy lump coal of stacking of diffusing coal, the cross-sectional area of stacking accounts for 1/4～3/4 of tunnel cross sectional area.Dump will be along a gang of or two help to stack intransfer gallery 8, and to stack to following combustion guidinggallery 5 in diffusing coal facies company.

Tomography 7 is a normal fault in the body of heater shown in Figure 2.Transfer gallery 8passes tomography 7 by the lower wall ofnormal fault 7, and to the dish of going up of tomography, middle one section is the rock inclined gallery, tunnels, links up with the coal seam 11 of hanging wall with the direction of going down the hill.

Embodiment 2:

Also show the situation of meeting head on to connectauxiliary counter-fire lane 9 ofpassing tomography 7 one ends attransfer gallery 8 among Fig. 1, shown in double dot dash line.For in the continuous combustion gasification of gasification face advances, increasetransfer gallery 8 and fire logical probability and reliability automatically with gasification face.Pass meeting head on oftomography 7 one ends attransfer gallery 8, again along the trend oftomography 7, in coal seam 11 pick one section auxiliary counter-fire lane 9.The length L inauxiliary counter-fire lane 9₈Can select 1～20m.Auxiliary counter-fire lane 9 meet head onrelative gas channel 2 between coal pillar width L₆, and following combustion guidinggallery 6 meet head on andgas channel 2 between coal pillar width L₅Require identical.Preferably stack dump in theauxiliary counter-fire lane 9, form is identical with upper and lower combustion guidinggallery 5,6.All the other are with embodiment 1.

Embodiment 3:

Roadway arrangement mode when running into thebig skew fault 7 of gradient in the body of heater has been shown among Fig. 3.When the tomography in the body ofheater 7 when being skew fault,tomography 7 trends with angle α 〉=25 of bearing °, because it is bigger that gasification face is advanced to the used time phase difference in tomography both sides, for the consideration that makes full use of resource,transfer gallery 8 should be selected intomography 7 andgasification tunnel 10 distances one side far away in the position of tomography excessively at this moment, promptly near one side ofgas channel 4, or be selected in gasification furnace and walk centre upwards.This moment, away fromgasification tunnel 10 1 sides, shorter alongtomography 7 trend, followingcombustion guiding gallery 6 length that excavate, last combustion guiding gallery 12 length were longer attomography 7; Simultaneously, last combustion guiding gallery 12 is also longer with 6 non-overlapped sections of following combustion guiding galleries.When non-overlapped section length 〉=20m, bygas channel 2 open the door the driving last combustion guiding gallery 12, its non-overlapped section can be neartomography 7 driving, when last combustion guiding gallery 12 during near the meeting head on ofcombustion guiding galleries 6 down,distance 5～20m, changes direction, drive up along the coal seam, when thedistance 5～15m that meets head on followingcombustion guiding gallery 6 or its extended line, change the orientation again, by the direction that is parallel to timecombustion guiding gallery 6, continue to excavate and followingcombustion guiding gallery 6 between overlay segment, promptly press coal pillar width L₂Requirement excavate near and be parallel to the down section of combustion guiding gallery 6.Pass meeting head on oftomography 7 one ends attransfer gallery 8, also can dig auxiliary counter-fire lane 9.All the other are withembodiment 1,2.

Tomography 7 in the body of heater shown in Fig. 4 is reversefaults.Transfer gallery 8 passes the go up dish oftomography 7 to tomography by the reverse fault lower wall, and one section is crossdrift in the middle of it, and it tunnels, links up with hanging wall coal seam 11 with horizontal direction.

Embodiment 4:

When the tomography in the underground gasification furnace or coal seam were moisture, the upper and lower combustion guidinggallery 5 and 6 the gradient were along level or certain positive gradient driving, so that the water of upper and lower combustion guidinggallery 5 and 6 can be flowed out naturally.

Embodiment 5:

Fig. 5 illustrates gas channel air inlet port, gas outlet a kind of situation of passing fracture of underground gasification furnace when different two dishes oftomography 7 respectively, promptly the air inlet port ofgas channel 2 upper ends andgasification path 10 at the same dish oftomography 7 andtomography 7 neargas channel 2 upper end air inlet ports.At this moment, gas outlet,gas channel 4 upper end is attomography 7 another dishes.During this passing fracture of underground gasification furnace, only pick combustion guidinggallery 6,transfer gallery 8 down, andauxiliary counter-fire lane 9 gone up combustion guidinggallery 5 and omit.Its down combustion guidinggallery 6 open the door bygas channel 4, at a dish driving of the tomography at place, gas outlet; The position oftransfer gallery 8 is located at air inlet port one side near gas channel 2.Associated length, coal pillar width and the coal piling requirement etc. in following combustion guidinggallery 6,transfer gallery 8 andauxiliary counter-fire lane 9, identical withembodiment 1,2.

In Fig. 5, the guiding channel that joins withgas channel 2 upper ends is:connection roadway 20 and little inclined shaft 13.Admission line 14 throughinclined shaft 13,connection roadway 20, passesairtight 19 air inlet ports togas channel 2 upper ends by ground.The guiding channel that joins withgas channel 4 upper ends is:connection roadway 18 and little vertical 16.The path of giving vent to anger: by theoutlet pipe 17 at the place, gas outlet that is connected ongas channel 4 upper ends, pass airtightly 19,, be connected toground gas flue 15 throughconnection roadway 18, little vertical 16.

Embodiment 6:

Fig. 6 illustrates gas channel air inlet port, the gas outlet another kind of situation of passing fracture of underground gasification furnace when different two dishes oftomography 7 respectively, promptly the gas outlet ofgas channel 4 upper ends andgasification path 10 attomography 7 same dishes andtomography 7 near gas outlets,gas channel 4 upper end.At this moment,gas channel 2 upper end air inlet ports are at another dish of tomography 7.During this passing fracture of underground gasification furnace, same only pick iscombustion guiding gallery 6,transfer gallery 8 andauxiliary counter-fire lane 9 down, goes up combustion guidinggallery 5 and omit.Its down combustion guidinggallery 6 open the door bygas channel 2, at a dish driving of thetomography 7 at air inlet port place; The position oftransfer gallery 8 is located neargas channel 4 gas outlets one side.All the other are withembodiment 5.

In Fig. 6, the guiding channel that joins withgas channel 2 upper ends is: connection roadway 22.Admission line 23 throughconnection roadway 22, passesairtight 19 air inlet ports togas channel 2 upper ends by down-hole air feed equipment 24.The guiding channel that joins withgas channel 4 upper ends is:connection roadway 18 and boring 21.The path of giving vent to anger:,, be connected toground gas flue 15 throughconnection roadway 18, boring 21 by the gas outlet ofgas channel 4 upper ends.

More than two examples be that tomography is a skew fault in the stove, and special circumstances that gradient is big, tomography is positioned at upper of furnace body.The inlet, outlet of gas channel at the underground gasification furnace of tomography two dishes, also may cause because of the restriction of atural object, landforms, building influence or factors such as downhole safety, back production respectively.After gasification face is crossed tomography,transfer gallery 8 andauxiliary counter-fire lane 9 will become fixing air inlet or outlet passageway, keep gasification and proceed.

Operating principle: in underground gasification furnace, light the gasification face that the back forms, combustion gasification, propelling constantly by initial gasification tunnel 10.In the time of near gasification face is advanced totomography 7, the combustion zone will move closer totransfer gallery 8 orauxiliary counter-fire lane 9, also finally combustion is logical with it.So the coal intransfer gallery 8 orauxiliary counter-fire lane 9 is ignited and is formed new wind path.If then form new wind path: air inlet 1 →gas channel 2 → former gasification face →transfer gallery 8 → following combustion guidinggallery 6 →gas channel 4 → steam vent 3 by air inlet 1 air intake this moment; This wind path is by ashamed thermalignition transfer gallery 8, the following combustion guidinggallery 6 of adding, instantly betweencombustion guiding gallery 6 and the last combustion guidinggallery 5 coal column of overlay segment reduce gradually and fire logical after, form a new wind path again: air inlet 1 →gas channel 2 → go up combustion guidinggallery 5 → following combustion guidinggallery 6 →gas channel 4 → steam vent 3.This promptly forms the new gasification tunnel that strides acrosstomography 7, makes the gasification of underground gasification furnace stride across tomography and proceeds, and is not blocked by tomography.

When if gasification face is advanced near thetomography 7, be by steam vent 3 air intakes, gasification face equally can be after neartransfer gallery 8 orauxiliary counter-fire lane 9, finally combustion is logical with it, and forms new wind path: the steam vent 3 →gas channel 4 → former gasification face →gas channel 2 → air inlet 1 of following combustion guidinggallery 6 →transfer gallery 8 →part.Transfer gallery 8 is successively burned with the coal of following combustion guidinggallery 6, instantly the coal column of combustion guidinggallery 6 and 5 overlay segments of last combustion guiding gallery reduce gradually and fire logical after, form new wind path: steam vent 3 →gas channel 4 → following combustion guidinggallery 6 → go up combustion guidinggallery 5 →gas channel 2 → air inlet 1; This promptly strides across the new gasification tunnel of tomography 7.Facts have proved that under given conditions, gasification face both can be gone with the wind, also can go against the wind, but the above method of crossing tomography is achieved.

Claims (8)

1. the method for a passing fracture of underground gasification furnace, using gasification tunnel (10), gas channel (2,4) and guiding channel thereof, make up in the process of underground gasification furnace, it is characterized in that: when in body of heater, running into drop more than or equal to the strike fault of coal seam thickness or skew fault (7), two dishes at tomography (7) coil away from one of gasification tunnel (10), move towards along tomography (7), open the door from two gas channels (2,4) respectively, relatively dig two adits: go up combustion guiding gallery (5) and following combustion guiding gallery (6); Following combustion guiding gallery (6) is near tomography (7) driving, with the spacing (L of tomography (7)₁) be 0～15m, meet head on or return 1～20m to open the door, dig the transfer gallery (8) that passes tomography (7) at following combustion guiding gallery (6); Transfer gallery (8) passes the coal seam (11) of tomography (7) to another dish of tomography (7); Length (L when transfer gallery (8)₇During)＞5m, must stack continuous diffusing coal in the lane; Last combustion guiding gallery (5) meet head on relative gas channel (4) between and down combustion guiding gallery (6) meet head on and relative gas channel (2) between, stay coal column, coal pillar width (L₄, L₅): girdle＞5m, in thick and high seam＞10m; Between last combustion guiding gallery (5) and the following combustion guiding gallery (6) one section overlay segment close to each other is arranged, the effective length (L of this overlay segment₈)＞5m, the coal pillar width (L between overlay segment place two combustion guiding galleries₂): girdle be 3～15m, in thick and high seam be 5～20m;

Air inlet port and gas outlet when underground gasification furnace two gas channels (2,4) upper ends, when laying respectively at upper and lower two dishes of tomography, pick combustion guiding gallery (6) and transfer gallery (8) thereof down only; Transfer gallery (8) should be located near its air inlet port or gas channel one side of gas outlet under tomography.

2. the method for passing fracture of underground gasification furnace according to claim 1, it is characterized in that: said transfer gallery (8), vertically pass tomography (7), after tomography (7) is seen coal excessively, to (11) continue driving 2～10m along the coal seam, and along tomography (7) trend, pick one section auxiliary counter-fire lane (9); Should auxiliary counter-fire lane (9) length (L₈) be 1～20m, its meet head on relative gas channel (2) between coal pillar width (L₆), and following combustion guiding gallery (6) is met head on and this gas channel (2) between coal pillar width (L₅) require identical.

3. the method for passing fracture of underground gasification furnace according to claim 2 is characterized in that: in said upper and lower combustion guiding gallery (5,6) and the auxiliary counter-fire lane (9), stack continuous diffusing coal; Said transfer gallery (8) is as its length (L₇During)≤5m, also to stack continuous diffusing coal in the lane; The stacking amount of diffusing coal will make it stack cross-sectional area and account for 1/4～3/4 of tunnel cross sectional area.

4. the method for passing fracture of underground gasification furnace according to claim 1 is characterized in that: said go up combustion guiding gallery (5) meet head on relative gas channel (4) between and down combustion guiding gallery (6) meet head on and relative gas channel (2) between coal pillar width (L₄, L₅): girdle is that 20～30m, medium-thickness seam are that 25～35m, high seam are 30～40m.

5. the method for passing fracture of underground gasification furnace according to claim 1 is characterized in that: the spacing (L of said combustion guiding gallery (6) down and tomography (7)₁) be 1～10m; Effective length (the L of upper and lower combustion guiding gallery (5,6) overlay segment₈) be 10～20m.

6. the method for passing fracture of underground gasification furnace according to claim 1, it is characterized in that: said tomography (7) is during for the skew fault of trend and angle α 〉=25 of bearing °, transfer gallery (8) is crossed the position of tomography, should be selected in a side of distance between tomography (7) and the gasification tunnel (10), or be selected in the centre that gasification furnace is walked to make progress.

7. according to the method for claim 1 or 6 described passing fracture of underground gasification furnace, it is characterized in that: said transfer gallery (8) is crossed the position of tomography, when causing the length of non-overlapped section of combustion guiding gallery 〉=20m, last combustion guiding gallery (12) is also near tomography (7) driving, when last combustion guiding gallery (12) pick to the following combustion guiding gallery (6) of distance is met head on 5～20m, change direction, drive up along the coal seam, when distance 5～15m of meeting head on following combustion guiding gallery (6) or its extended line, change the orientation again, by the direction of parallel down combustion guiding gallery (6), continue to excavate and following combustion guiding gallery (6) between overlay segment.

8. the method for passing fracture of underground gasification furnace according to claim 1, it is characterized in that: when the coal seam in said tomography or the body of heater is moisture, the gradient of upper and lower combustion guiding gallery (5,6) flows out the water of upper and lower combustion guiding gallery (5,6) along level or positive gradient driving naturally.

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